Sketching apparatus



SQGREFSTAD. SKETOHING APPARATUS.

No. 499,224. Patented June 13, 1893.

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UNITED STATES SWAN GREFSTAD, OF DULUTH, MINNESOTA.

PATENT GFFICE SKETCHING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 499,224, dated June 13, 1893.

Application filed July 12, 1892. Serial Ila-439,883. (No model.)

To all whom it may concern.-

Be it known that I, SWAN GREFSTAD, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements inSketching Apparatus; and I do declare the following to be a full, clear, and exact description, of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in apparatus for sketching objects at long distances.

The objects of my invention are, first, to enable a person to more accurately transfer onto paper or other surface used to paint on, distant objects; second, to provide an apparatus that can be used by an inexperienced person for sketching preparatory to drafting or painting. I obtain these objects by the construction and arrangement of parts illustrated in the accompanying drawings, in which Figure 1, is a side elevation of my apparatus, set up complete and ready for use. Fig. 2, is a rear elevationof the apparatus. Fig. 3, is a top plan view of the instrument, not quite complete. Figs. 4, and 5, are enlarged detailed views of certain parts of the instrument.

Referring by figures of reference to the different parts of the drawings, 1, are the legs, 2, the head of a tripod, adapted to stand upon the ground and hold the apparatus at the desired height. Upon the head 2, is secured a horizontal fiat metallic bar 4, the outer ends of which are bent upward at right angles with the bar 4, and form the two side brackets 5, through which are screw-threaded the thumbscrews 6, (best shown in Figs. 1, and 2,) the points of which are let into the edge of the drawing board, so that the drawing board may be tilted forward and backward on said screw points as pivots or trunnions. To the angular corner or base of the brackets 5, I secure two horizontal arms 8, (see Fig. 1.) to the free ends of which I pivot two braces 9, the upper half of which is provided with slots 10, through which shouldered thumb-screws 11, are passed and screwed into the edge or frame of the drawing board7; these braces and screws serve to secure the drawing board 7, in whatever position it is tilted or set for sketching objects far above or below the horizontal plane. Y

At or near the upper corners of the drawing board 7 ,I secure the two standards or guides 12, upon which slide the blocks 13, which are firmly secured together by the horizontal guide bar 14, which in the present instance,

is square (as shown in Fig. 4),but may be of any other shape, (except round.) Upon this bar 14, slides a nicely fitted tube or block 15, in the upper side of which is journaled the round shank 16, of the-fork 17, through the arms of which are screw-threaded thumbscrews 18, the points of which are slightly let into the sides of and form trunnion joints for the telescope 19, which is secured by one side 'to a horizontal bar 21, the rear portion of which slides in a box or tube 22, held between set-screw points as trunnions in the fork 23, of which the downwardly extendinground shank 24, is journaled in the head 25, at the rear end of the rod 26, which extends from said head 25, downward, then outward as 27, then forward as 28, passing through a bracket or box 29, secured at the edge of the drawing table in which it is adjustably secured by a thumb-screw 30. g 7

31, is an offset in the'guide rod 21, to admit the head of the operator to get into proper position to look into the telescope. To the sliding block 15, I secure a handle 32 (best shown in section in Fig. 4). Said handle is open inside and provided with a downward hanging rod 33, pivoted at 34, inside the handle, and suspended down through an aperture or slot 35.

In the lower end of the rod 33, I secure a pencil or other marking tool 36, pointing toward the surface of the drawing board, upon which the paper or canvas is to be stretched. The upper end of the rod 33 is provided with a stem 37, projecting through an aperture in front side of the'handle and having a press button 38, outside the handle.

39, is a spring holding the upper end of the rod 33, forward against the inner side of the handle, thereby holding the lower end of the rod and the pencil or marker 36, a short distance away from the drawing board 7.

The telescope 19, is provided at its lenses with crossing hairs or other fine sighting marks not shown in the drawings,butby which aim is taken through the telescope of any point or points of the object to be drafted.

In operation the paper is stretched upon the drawing board 7. The operator then takes hold of the handle 32, places his forefinger on the press button 38, and looking through the telescope he takes aim at all the points of the object he wishes to draft, and for each point he sights he presses on the button 38, thereby throwing the pencil or marker 36, against the paper on the drawing board causing to be produced upon it marks between which lines are afterwarddrawn. When the object to be sketched is very large or near by, the rod 28, is moved forward in the bracket 30, and if small or far away, the rod 28, is moved back so as to get the swivel fork 23, as far as possible away from the telescope. It will-be understood that by means of the sliding blocks 13, 15, and the swivel forks 17, 23, and tilting block 22, the telescope 19, may be moved in any direction so as to bring the pencil 36, to any desired part of the drawing board orpaper fastened thereon.

Having thus described my invention, what.

I 012tll1l,,t11d desire to secure by Letters Patent, is-- In an instrument for sketching distant objects, the combination of the tripod 1, 2, the bracket bar 4, 5, having a tilting drawing board pivotally secured to said brackets, the arms 8, braces 9, and thumb-screws 11, for bracing the drawing board at different angles orpositions, with the upright guide bars 12, secured at the upper corners of the drawing board, the sliding blocks 13, the angular or square horizontalzguide bar 14, secured to the said blocks 13, the sliding block 15, having the handle 32, pivoted rod 33, press button .38, spring 39, and a pencil or marker 36; said ,block 15, also carrying a telescope as 19, or other sighting device pivotally secured in a 3 swivel fork as 17, the offset guide rod 21, restjing and sliding in a tilting block as 22, in a swivel fork as 23, in the end of a supporting rod or arm as 26, 27, 28, adj ustably secured in a bracket as, 29, by a set screw as 30, on the drawing board, substantially as shown and described and for the purpose set forth.

In testimony whereof Laffix my signature in presence of two witnesses.

SWAN GREFSTAD.

Witnesses:

S. MORTENED, L. O. HULBERY. 

